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It 1 !Kill I <br /> E <br /> GT ENVIRONMENTAL LABORATORY (GTEL)• <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING FIELD PR.ESI;RVATJON OF BTX SAMPLES <br /> By ACIDIFICATION <br /> F.w SOP 12 <br /> If specially prepared acidified vials are not available a <br /> _. the following Field Procedures, <br /> kit. The kit contains; using the field acidiE}cationx <br /> a) 500 cc glass measuring cup or breaker. <br /> b) dropping bottle of 508 hydrocloric acid or nitric <br /> acid. <br /> d) narrow range pH paper, 1.0-2.5 pH range. <br /> glass stirring rod. <br /> I- Collect aliProximately 300c;c of water in beaker. Try to <br /> minimize turbulence, bubbling, <br /> air. and time of exposure to the <br /> 2. For inorganic analysis; use 508 nitric acid <br /> For volatile organic analysis; use 508 hydrocloric acid <br /> Add 30 drops of 508 acid to measuring cup. <br /> completely vertically. Hold dropper <br /> r 3. Gently mix with glass bar. <br /> 4. Remove bar and touch wetted tip to the PH paper and check <br /> color code to assure it is below pR 2. As more acid is <br /> added the pH goes lower. Discard used pis strip. <br /> 5. Add more acid if neVOSsary. Too much acid is not a ,r <br /> obl <br /> °~ just record how much was added (this will be helpful�nextem, <br /> time). Don't waste time trying to get it right - just add <br /> plenty of acid to get it below pH 2. Ideally, once you know <br /> i .� how Much acid needs to be added at one well, that amount <br /> will be sufficient for the refit. However, <br /> time. teat the pH each <br /> 5. Pour the water into the vials Prepared for that well and cap <br /> Off with no bubbles inside. Again turbulence and bubbling <br /> a are to be minimized. Also note that it is Important that all of the vials for a given well be poured and sealed one <br /> right after another. Make sure the 300rc collected is <br /> enough to fill all of the vials with some to spare at the <br /> ri• end. The volume collected can be increased but remember to <br /> proportionally increase the amount Of Acid added. <br /> a. Acidification does not replace chilling. Always chill <br /> samples and ship via air for next day delivery. <br />